Class: RedisCacheStore

Inherits:
Object
  • Object
show all
Defined in:
lib/cache_store_redis/redis_cache_store.rb

Overview

This class is used to implement a redis cache store.

Constant Summary collapse

DEFAULT_TTL =

Default expiry time if not provided. (1 hour)

3_600

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(namespace = nil, config = nil) ⇒ RedisCacheStore

Returns a new instance of RedisCacheStore.



6
7
8
9
10
11
12
13
14
15
16
 
# File 'lib/cache_store_redis/redis_cache_store.rb', line 6

def initialize(namespace = nil, config = nil)
  @connection_pool = RedisConnectionPool.new(namespace, config)

  @namespace = namespace
  @config = config

  @connections_created = 0
  @connections_in_use = 0
  @mutex = Mutex.new
  @enable_stats = false
end

Instance Attribute Details

#connection_pool ⇒ Object (readonly)

Returns the value of attribute connection_pool.



18
19
20
 
# File 'lib/cache_store_redis/redis_cache_store.rb', line 18

def connection_pool
  @connection_pool
end

Instance Method Details

#clean ⇒ Object Also known as: shutdown 



47
48
49
 
# File 'lib/cache_store_redis/redis_cache_store.rb', line 47

def clean
  connection_pool.shutdown
end

#configure(host = 'localhost', port = 6379, db = 0, password = nil, driver: nil, url: nil, connect_timeout: 0.5, read_timeout: 1, write_timeout: 0.5) ⇒ Object

This method is called to configure the connection to the cache store.



21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
 
# File 'lib/cache_store_redis/redis_cache_store.rb', line 21

def configure(host = 'localhost',
              port = 6379,
              db = 0,
              password = nil,
              driver: nil,
              url: nil,
              connect_timeout: 0.5,
              read_timeout: 1,
              write_timeout: 0.5)
  if !url.nil?
    @config = {}
    @config[:url] = url
    @config[:db] = db
  else
    @config = { host: host, port: port, db: db }
  end

  @config[:password] = password unless password.nil?
  @config[:driver] = driver unless driver.nil?

  @config[:connect_timeout] = connect_timeout
  @config[:read_timeout] = read_timeout
  @config[:write_timeout] = write_timeout
  connection_pool.config = @config
end

#exist?(key) ⇒ Boolean

This method is called to check if a value exists within this cache store for a specific key.

Parameters:

  • key (String) —

    This is the unique key to reference the value to check for within this cache store.

Returns:

  • (Boolean) —

    True or False to specify if the key exists in the cache store.



124
125
126
127
128
 
# File 'lib/cache_store_redis/redis_cache_store.rb', line 124

def exist?(key)
  with_client do |client|
    !client.exists(build_key(key)).zero?
  end
end

#get(key, expires_in = 0) ⇒ Object Also known as: read

This method is called to get a value from this cache store by it’s unique key.

(This is used in conjunction with the block to hydrate the cache key if it is empty.) when it is not found.

Parameters:

  • key (String) —

    This is the unique key to reference the value to fetch from within this cache store.

  • expires_in (Integer) (defaults to: 0) —

    This is the number of seconds from the current time that this value should expire.

  • &block (Block) —

    This block is provided to hydrate this cache store with the value for the request key

Returns:

  • (Object) —

    The value for the specified unique key within the cache store.



90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
 
# File 'lib/cache_store_redis/redis_cache_store.rb', line 90

def get(key, expires_in = 0)
  k = build_key(key)

  value = with_client do |client|
    client.get(k)
  end

  if !value.nil? && value.strip.empty?
    value = nil
  else
    value = deserialize(value) unless value.nil?
  end

  if value.nil? && block_given?
    value = yield
    set(key, value, expires_in)
  end

  value
end

#ping ⇒ String

Ping the cache store.

Returns:

  • (String) —

    ‘PONG`



133
134
135
136
137
 
# File 'lib/cache_store_redis/redis_cache_store.rb', line 133

def ping
  with_client do |client|
    client.ping
  end
end

#remove(key) ⇒ Object Also known as: delete

This method is called to remove a value from this cache store by it’s unique key.

Parameters:

  • key (String) —

    This is the unique key to reference the value to remove from this cache store.



114
115
116
117
118
 
# File 'lib/cache_store_redis/redis_cache_store.rb', line 114

def remove(key)
  with_client do |client|
    client.del(build_key(key))
  end
end

#set(key, value, expires_in = DEFAULT_TTL) ⇒ Object Also known as: write

This method is called to set a value within this cache store by it’s key.

Parameters:

  • key (String) —

    This is the unique key to reference the value being set within this cache store.

  • value (Object) —

    This is the value to set within this cache store.

  • expires_in (Integer) (defaults to: DEFAULT_TTL) —

    This is the number of seconds from the current time that this value should expire.



61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
 
# File 'lib/cache_store_redis/redis_cache_store.rb', line 61

def set(key, value, expires_in = DEFAULT_TTL)
  k = build_key(key)

  v = if value.nil? || (value.is_a?(String) && value.strip.empty?)
        nil
      else
        serialize(value)
      end

  expiry_int = Integer(expires_in)
  expire_value = expiry_int.positive? ? expiry_int : Integer(DEFAULT_TTL)

  with_client do |client|
    client.multi do
      client.set(k, v)

      client.expire(k, expire_value)
    end
  end
end

#with_client(&block) ⇒ Object 



52
53
54
 
# File 'lib/cache_store_redis/redis_cache_store.rb', line 52

def with_client(&block)
  connection_pool.with_connection(&block)
end